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commandlinefu.com is the place to record those command-line gems that you return to again and again.

Delete that bloated snippets file you've been using and share your personal repository with the world.
That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and
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Follow the Tweets.

Every new command is wrapped in a tweet and posted
to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning,
there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.

Sometimes, especially when parsing HTML, you want "all text between two tags, that doesn't contain another tag".

For example, to grab only the contents of the innermost <div>s, something like:

/<div\b[^>]*>((?:(?!<div).)*)</div>/

...may be your best option to capture that text.

It's not always needed, but is a powerful arrow in your regex quiver in those cases when you do need it.

Note that, in general, regular expressions are the Wrong Choice for parsing HTML, anyway. Better approaches are solutions which let you navigate the HTML as a proper DOM. But sometimes, you just need to use the tools available to you. If you don't, then you have two problems.